Center a column using Twitter Bootstrap-第3页回答

How do I center a div of one column size within the container (12 columns) in Twitter Bootstrap 3.

Please see the starter fiddle.

<body class="container">
    <div class="col-lg-1 col-offset-6 centered">
        <img data-src="holder.js/100x100" alt="" />
    </div>
</body>

So, I want a div, with a class centered to be centered within the container. I may use a row if there are multiple divs, but for now I just want a div with size of one column centered within the container (12 columns).

I am also not sure the above approach is good enough as the intention is not to offset the div by half. I do not need free spaces outside the div and the contents of the div shrink in proportion. I want to empty space outside the div to be evenly distributed (shrink till the container width == one column).

标签： css twitter-bootstrap twitter-bootstrap-3 centering

30条回答

还给你的自由

2楼-- · 2018-12-31 03:36

You can use text-center for the row, and make sure the internal divs have display:inline-block ( with not float )

as:

<div class="container">
    <div class="row text-center" style="background-color : black;">
        <div class="redBlock">A red block</div>
        <div class="whiteBlock">A white block</div>
        <div class="yellowBlock">A yellow block</div>
    </div>
</div>

and css:

.redBlock {
    width: 100px;
    height: 100px;
    background-color: aqua;
    display: inline-block
}
.whiteBlock {
    width: 100px;
    height: 100px;
    background-color: white;
    display: inline-block
}
.yellowBlock {
    width: 100px;
    height: 100px;
    background-color: yellow;
    display: inline-block
}

The fiddle: http://jsfiddle.net/DTcHh/3177/

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唯独是你

3楼-- · 2018-12-31 03:36

Note if you are using Bootstrap 4, you can use .align-items-center in your row as Boostrap 4 now uses flex system.

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大哥的爱人

4楼-- · 2018-12-31 03:37

Because I never have the need to center only a single .col- within a .row, I set the following class on the wrapping .row of my target columns.

.col-center > [class*="col-"] {
    float: none;
    margin-left: auto;
    margin-right: auto;
}

Example

<div class="full-container">
    <div class="row col-center">
        <div class="col-xs-11">
            Foo
        </div>
        <div class="col-xs-11">
            Bar
        </div>
    </div>
</div>

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怪性笑人.

5楼-- · 2018-12-31 03:38

There are two approaches to centering a column <div> in Bootstrap 3:

Approach 1 (offsets):

The first approach uses Bootstrap's own offset classes so it requires no change in markup and no extra CSS. The key is to set an offset equal to half of the remaining size of the row. So for example, a column of size 2 would be centered by adding an offset of 5, that's (12-2)/2.

In markup this would look like:

<div class="row">
    <div class="col-md-2 col-md-offset-5"></div>
</div>

Now, there's an obvious drawback for this method, it only works for even column sizes, so only .col-X-2, .col-X-4, col-X-6, col-X-8 and col-X-10 are supported.

Approach 2 (the old margin:auto)

You can center any column size by using the proven margin: 0 auto; technique, you just need to take care of the floating that is added by Bootstrap's grid system. I recommend defining a custom CSS class like the following:

.col-centered{
    float: none;
    margin: 0 auto;
}

Now you can add it to any column size at any screen size and it will work seamlessly with Bootstrap's responsive layout:

<div class="row">
    <div class="col-lg-1 col-centered"></div>
</div>

Note: With both techniques you could skip the .row element and have the column centered inside a .container but you would notice a minimal difference in the actual column size because of the padding in the container class.

Update:

Since v3.0.1 Bootstrap has a built-in class named center-block that uses margin: 0 auto but is missing float:none. You can add that to your CSS to make it work with the grid system.

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残风、尘缘若梦

6楼-- · 2018-12-31 03:38

This is probably not the best answer, but there is one more creative solution to this. As pointed out by koala_dev the column offsetting works only for even column sizes. However, by nesting rows you can achieve centering uneven columns as well.

To stick with the original question where you want to center a column of 1 inside a grid of 12.

Center a column of 2 by offsetting it 5
Make a nested row, so you get a new 12 columns inside your 2 columns.
Since you want to center a column of 1, and 1 is "half" of 2 (what we centered in step 1), you now need to center a column of 6 in your nested row, which is easily done by offsetting it 3.

For example:

<div class="container">
  <div class="row">
    <div class="col-md-offset-5 col-md-2">
      <div class="row">
        <div class="col-md-offset-3 col-md-6">
          centered column with that has an "original width" of 1 col
        </div>
      </div>
    </div>
  </div>
</div>

See this fiddle, please note that you have to increase the size of the output window in order too see the result, otherwise the columns will wrap.

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一个人的天荒地老

7楼-- · 2018-12-31 03:41

For those looking to center the column elements on the screen when you don't have the exact number to fill your grid, I have written a little piece of JavaScript to return the class names:

function colCalculator(totalNumberOfElements, elementsPerRow, screenSize) {
    var arrayFill = function (size, content) {
        return Array.apply(null, Array(size)).map(String.prototype.valueOf, content);
    };

    var elementSize = parseInt(12 / elementsPerRow, 10);
    var normalClassName = 'col-' + screenSize + '-' + elementSize;
    var numberOfFittingElements = parseInt(totalNumberOfElements / elementsPerRow, 10) * elementsPerRow;
    var numberOfRemainingElements = totalNumberOfElements - numberOfFittingElements;
    var ret = arrayFill(numberOfFittingElements, normalClassName);
    var remainingSize = 12 - numberOfRemainingElements * elementSize;
    var remainingLeftSize = parseInt(remainingSize / 2, 10);
    return ret.concat(arrayFill(numberOfRemainingElements, normalClassName + ' col-' + screenSize + '-push-' + remainingLeftSize));
}

If you have 5 elements and you want to have 3 per row on a md screen, you do this:

colCalculator(5, 3, 'md')
>> ["col-md-4", "col-md-4", "col-md-4", "col-md-4 col-md-push-2", "col-md-4 col-md-push-2"]

Keep in mind, the second argument must be dividable by 12.

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Center a column using Twitter Bootstrap

Approach 1 (offsets):

Approach 2 (the old margin:auto)

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